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Telesystems Conference, 1993. 'Commercial Applications and Dual-Use Technology', Conference Proceedings., National

Date 16-17 June 1993

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  • Proceedings of 1993 IEEE National Telesystems Conference

    Publication Year: 1993
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    Freely Available from IEEE
  • FLAPS reflector antennas

    Publication Year: 1993 , Page(s): 233 - 238
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (644 KB)  

    A flat parabolic surface (FLAPS) reflector is a thin (planar or conformal) surface consisting of an array of elements, each functioning as a radiator and phase shifter. Unlike a conventional planar array, however, the elements on the FLAPS surface are spatially fed using a feed assembly, as in a conventional reflector system. This results in an antenna technology that offers the advantages of both... View full abstract»

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  • A new CFAR processor in nonhomogeneous background and multiple target situations

    Publication Year: 1993 , Page(s): 221 - 225
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (396 KB)  

    The authors consider the problem of CFAR (constant false-alarm rate) detection in nonhomogeneous clutter and in multiple target situations. The data discriminator (DD) CFAR detector which performs two passes over the data, is proposed and analyzed. In the first pass, the algorithm senses possible interfering targets, and in the second pass the algorithm selects those samples which are identically ... View full abstract»

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  • On the processing gain and pulse compression ratio of frequency hopping spread spectrum waveforms

    Publication Year: 1993 , Page(s): 215 - 219
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (260 KB)  

    The authors consider the pulse compression ratio and processing gain of frequency hopping spread spectrum waveforms. The importance of the frequency separation-subpulse width product is studied. Typical autocorrelation functions for coherent and noncoherent frequency hopping systems are given View full abstract»

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  • Autonomous precision approach and landing system APALS

    Publication Year: 1993 , Page(s): 101 - 107
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (492 KB)  

    The autonomous precision approach and landing system (APALS) system is a precision approach and landing system designed to enable low-visibility landings at many more airports than is now possible. It is an autonomous navigation system which uses standard avionics equipment to determine the aircraft position and altitude with respect to unique terrain features over which the aircraft flies. The pr... View full abstract»

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  • A versatile, broadband, low-profile antenna

    Publication Year: 1993 , Page(s): 227 - 231
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (400 KB)  

    The recently invented spiral-mode microstrip (SMM) antenna is finding application in various commercial systems as well as various military systems in addition to the military application for which it was developed. The salient features of this antenna are reviewed with respect to those applications for which interest in the antenna has been strongest. The salient features of the new antenna are b... View full abstract»

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  • Evaluation of candidate millimeter wave radars for synthetic vision

    Publication Year: 1993 , Page(s): 83 - 89
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (492 KB)  

    In 1988 the US Federal Aviation Administration, in cooperation with industry, the US Air Force, the US Navy, and several other government organizations, initiated an effort to demonstrate the capabilities of existing technologies to provide an image of the runway and surrounding environment for pilots operating aircraft in low-visibility conditions. This effort was named the synthetic vision techn... View full abstract»

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  • Velocity matched filtering/coherent integration of ultrawideband pulse trains

    Publication Year: 1993 , Page(s): 191 - 195
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (436 KB)  

    The development of optically activated semiconductor switches has advanced to the point where they are ready for implementation in radar systems. Extended detection range is possible when the switch is operated at high pulse repetition frequencies combined with integration of multiple pulse returns. Coherent integration of the returns from moving targets is described, based on real signal processi... View full abstract»

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  • Influence of various PCS spectrum allocation schemes on the ability to share spectrum with incumbent microwave users in the 1850-1990 MHz band

    Publication Year: 1993 , Page(s): 45 - 53
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (520 KB)  

    The success of personal communication services (PCS) rests in the ability to share spectrum with incumbent microwave users in the 1850-1990-MHz band. Spectrum allocations from 20 MHz to 40 MHz per PCS licensee are being considered by the FCC. While it may be possible to make some spectrum available by negotiating relocation agreements with certain of the microwave users in a given MSA, local gover... View full abstract»

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  • Applications of the global positioning system to intelligent vehicle highway systems

    Publication Year: 1993 , Page(s): 139 - 141
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (228 KB)  

    The Intelligent Vehicle Highway System (IVHS) program is aimed at reducing traffic congestion and motor vehicle emissions, and at improving highway safety, by applying advanced communications and computer technologies. The author examines the user requirements and system functions contemplated for IVHS, and discusses the surveillance and navigation services that are required to support them. Compa... View full abstract»

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  • Microwave optics for space and ground communications

    Publication Year: 1993 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (484 KB)  

    Fiber optic and free space laser communications operating in microwave and millimeter-wave (M/MM) frequencies provide numerous advantages. Various M/MMW fiber optic and lasercom system applications, including satellite communications, phased-arrays, and antenna remotings for cellular/wireless/personal communications are described. Commercially available and state-of-the-art key components required... View full abstract»

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  • Transportable orbital tracking, telemetry and command system

    Publication Year: 1993 , Page(s): 241 - 249
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (520 KB)  

    NASA/Goddard Space Flight Center has implemented an automated ground-based telemetry, command, and Doppler system. Its function is to support the low-earth-orbiting satellite and sounding rocket programs. This fully transportable system can be configured with the capability to provide unmanned satellite support for seven days or operator augmented automated sounding rocket launch and tracking supp... View full abstract»

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  • Multiwavelength photonic communications

    Publication Year: 1993 , Page(s): 15 - 20
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (504 KB)  

    The integration of multiwavelength technology into practical fiber optic communication systems is gradually becoming a reality because the required important wavelength tunable components are readily available. The author reviews several important multiwavelength system applications and briefly describes the key components, both commercially available and the state-of-the-art, for those systems. T... View full abstract»

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  • Detection of signals with a fractal model

    Publication Year: 1993 , Page(s): 209 - 213
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (328 KB)  

    A common problem in signal processing is the detection of signals in noisy environments. The author presents a fractal model to detect signals where detection is linked to the geometric complexity of the signal. He illustrates the utility of this approach to different signal types such as sinusoids and speech. It is shown that this approach is extendible to detection of two-dimensional data, such ... View full abstract»

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  • A comparative study of JPEG and residual VQ compression of radar imagery

    Publication Year: 1993 , Page(s): 203 - 207
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (328 KB)  

    The Joint Photographic Expert Group (JPEG) compression standard and a type of vector quantization called residual vector quantization (RVQ) are evaluated for the real-time compression of precision approach radar (PAR) video data. Experimental results obtained from simulated PAR imagery are presented which allow a performance and complexity comparison of the two compression methods. For low to mode... View full abstract»

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  • Synthetic vision/enhanced vision system implementation

    Publication Year: 1993 , Page(s): 91 - 95
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (488 KB)  

    There is an emerging requirement within the world's air transport network to improve safety and increase productivity by enabling aircraft to perform visual flight operations under low-visibility weather conditions. Currently, the commercial aviation industry has centered its efforts at achieving this requirement around a millimeter-wave imaging radar and/or imaging infrared (IR) sensor, a Global ... View full abstract»

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  • ATMS 2000: hybrid automation or a lights out traffic management center?

    Publication Year: 1993 , Page(s): 37 - 42
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (456 KB)  

    Because of rapid advances in information and automation technology, traffic management center (TMC) design is in a period of rapid evolution. Larger numbers of more capable traffic and environmental sensors are being fielded. Data fusion and information processing equipment are beginning to exploit this new quantity and quality of information. Automation of routine tasks may help to moderate peaks... View full abstract»

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  • Advanced RF cards for fare collection

    Publication Year: 1993 , Page(s): 31 - 35
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (324 KB)  

    Transit fare collection systems are discussed. The public transit industry has shown a strong interest in the value that smart cards can bring to the fare collection process. At the same time, the toll collection industry has migrated to radio frequency (RF) methods for advanced electronic toll collection and traffic management (ETTM) systems. The ideal solution to the fare collection problem may ... View full abstract»

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  • Characterization of the PACSAT file broadcast system

    Publication Year: 1993 , Page(s): 71 - 79
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (604 KB)  

    Since January 1990, amateur radio operators around the world have had the opportunity to use several low-Earth-orbit satellites providing store-and-forward communications services. The author focuses on the broadcast mode of operation as implemented on the PACSAT-1 and UoSAT-5 amateur radio satellites in 1992. The evolutionary process leading to the broadcast mode of operation is given along with ... View full abstract»

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  • Performance of coded QPSK modulation for the delivery of MPEG-2 stream compared to analog FM modulation

    Publication Year: 1993 , Page(s): 121 - 125
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (276 KB)  

    The author compares the performance of coded quadrature phase-shift keying (QPSK) and analog frequency modulation (FM) for the delivery of video services by satellite. The proposed digital video scheme uses the Motion Picture Experts Group (MPEG-2) video compression with a concatenated coding. The performance of both systems is compared. The digital video scheme is shown to be more robust in noise... View full abstract»

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  • A large W-band slotted waveguide array

    Publication Year: 1993
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (24 KB)  

    Summary form only given. Slotted arrays at millimeter-wave frequencies play an important role in commercial applications such as collision radars and synthetic vision systems. The authors describe the design, fabrication and testing of a 3-ft-long slotted waveguide array having 600 edge wall slots. The design represents a low-loss technique for achieving a high-resolution pattern and uses a standa... View full abstract»

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  • Pseudo windowing for synthetic sampled aperture radar target detection

    Publication Year: 1993 , Page(s): 185 - 189
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (328 KB)  

    The authors introduce a significant modification to the coherent integration algorithm of synthetic sampled aperture radar (SSAMAR) processing to achieve Hamming-like or cosine to the fourth-like tapering. Only pseudo Hamming or cosine to the fourth tapering is possible because the coefficients of the coherently integrated SSAMAR returns are integers. In other words, the coefficients of the return... View full abstract»

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  • A passive millimeter wave camera for landing under low visibility conditions

    Publication Year: 1993 , Page(s): 109 - 115
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (724 KB)  

    Passive millimeter wave (PMMW) focal plane array cameras are new sensors capable of imaging the forward scene under fog and low-visibility conditions at video frame rates. PMMW imaging sensors measure the blackbody radiation naturally emitted from the imaged scene. These cameras promise to be an effective aid, or an alternative, to existing technology for aircraft landing and surface operations un... View full abstract»

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  • Optical beam forming and steering for phased-array antenna

    Publication Year: 1993 , Page(s): 7 - 12
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (640 KB)  

    Application of photonics in beam forming and steering for phased-array antennas is addressed in this paper. The feasibility of photonics in space communications systems centers around the basic issues such as the need for photonics and derived benefits, overall performance, and complexity and cost of implementation. Several optical beam forming and steering payloads are assessed for their capabili... View full abstract»

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  • Smart card applications in integrated transit fare, parking fee and automated toll payment systems-the MAPS concept

    Publication Year: 1993 , Page(s): 21 - 25
    Cited by:  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (388 KB)  

    The concept for a multimodal access and payment system (MAPS) promising to provide a common mechanism for the payment of transit fares, parking fees, tolls and other transportation-related items is described. MAPS will focus on the use of smart card technology and smart cards interfaced to RF transponders on vehicles to relieve the traffic congestion and air pollution problems which are becoming i... View full abstract»

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